From the Super Mario Wiki, the Mario encyclopedia
Coincentration is a minigame that first appears in Super Mario 64 DS. It later appears in New Super Mario Bros. as a multiplayer and single player Puzzle minigame. Its name is a portmanteau of "coin" and "concentration."
The game starts with Wario on the top screen standing next to a Moneybags; he punches it into the air, and forty coins then fall down and make their way into the Brick Blocks as the Moneybags bounces offscreen. The player must use the stylus to tap the bricks containing coins; if the player taps a brick with no coins, the game will end. The highest possible score that the player can obtain in this game is the "perfect" score of 40.
In the multiplayer version in New Super Mario Bros., the basic premise is similar, but each player instead takes turns choosing a block. If a player taps a block with no coins, the block will break, and the player will lose two points; it is possible to have a negative score in this mode. Once all the coins are found, the person with the most coins wins.
Pay attention to where the falling coins land. Touch the blocks to retrieve the coins. But if you choose the wrong block, your game will end.
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